#!/bin/sh /etc/rc.common
# Copyright (C) 2010-2014 OpenWrt.org

START=99
USE_PROCD=1
PROG=/usr/sbin/igmpproxy
CONFIGFILE=/var/etc/igmpproxy.conf

# igmpproxy supports both a debug mode and verbosity, which are very useful
# when something isn't working.
#
# Debug mode will print everything to stdout instead of syslog. Generally
# verbosity should NOT be set as it will quickly fill your syslog.
#
# Put any debug or verbosity options into IGMP_OPTS
#
# Examples:
# OPTIONS="-d -v -v" - debug mode and very verbose, this will land in
#                        stdout and not in syslog
# OPTIONS="-v" - be verbose, this will write aditional information to syslog

OPTIONS=""

igmp_header() {
	local quickleave
	config_get_bool quickleave "$1" quickleave 0

	mkdir -p /var/etc
	rm -f /var/etc/igmpproxy.conf
	[ $quickleave -gt 0 ] && echo "quickleave" >> /var/etc/igmpproxy.conf

	[ -L /etc/igmpproxy.conf ] || ln -nsf /var/etc/igmpproxy.conf /etc/igmpproxy.conf
}

igmp_add_phyint() {
	local network direction altnets device up

	config_get network $1 network
	config_get direction $1 direction
	config_get altnets $1 altnet

	local status="$(ubus -S call "network.interface.$network" status)"
	[ -n "$status" ] || return

	json_load "$status"
	json_get_var device l3_device
	json_get_var up up

	[ -n "$device" -a "$up" = "1" ] || {
		procd_append_param error "$network is not up"
		return;
	}

	append netdevs "$device"

	[[ "$direction" = "upstream" ]] && has_upstream=1

	echo -e "\nphyint $device $direction ratelimit 0 threshold 1" >> /var/etc/igmpproxy.conf

	if [ -n "$altnets" ]; then
		local altnet
		for altnet in $altnets; do
			echo -e "\taltnet $altnet" >> /var/etc/igmpproxy.conf
		done
	fi
}

igmp_add_network() {
	local network

	config_get network $1 network
	procd_add_interface_trigger "interface.*" $network /etc/init.d/igmpproxy reload
}

igmp_add_firewall_routing() {
	config_get network $1 network
	config_get direction $1 direction

	[[ "$direction" = "downstream" ]] || return 0

	json_add_object ""
	json_add_string type rule
	json_add_string src "$upstream"
	json_add_string dest "$network"
	json_add_string family ipv4
	json_add_string proto udp
	json_add_string dest_ip "224.0.0.0/4"
	json_add_string target ACCEPT
	json_close_object
}

igmp_add_firewall_network() {
	config_get network $1 network
	config_get direction $1 direction

	json_add_object ""
	json_add_string type rule
	json_add_string src "$network"
	json_add_string proto igmp
	json_add_string target ACCEPT
	json_close_object

	[[ "$direction" = "upstream" ]] && {
		upstream="$network"
		config_foreach igmp_add_firewall_routing phyint
	}
}

service_triggers() {
	procd_add_reload_trigger "igmpproxy"
}

start_service() {
	has_upstream=
	netdevs=
	config_load igmpproxy

	config_foreach igmp_header igmpproxy
	config_foreach igmp_add_phyint phyint
	[ -n "$has_upstream" ] || return

	procd_open_instance
	procd_set_param command $PROG
	[ -n "$OPTIONS" ] && procd_append_param $OPTIONS
	procd_append_param command $CONFIGFILE
	procd_set_param file $CONFIGFILE
	procd_set_param netdev $netdevs
	procd_set_param respawn
	procd_open_trigger
	config_foreach igmp_add_network phyint
	procd_close_trigger

	procd_open_data

	json_add_array firewall
	config_foreach igmp_add_firewall_network phyint
	json_close_array

	procd_close_data

	procd_close_instance
}

service_started() {
	procd_set_config_changed firewall
}
